Javascript 为JS aray中的每个值创建变量

上传文件到拖放区后，我需要在上传文件列表旁边显示一个表单输入字段，允许将标签名称输入添加到图像中

$(function(){

    var ul = $('#upload ul'); 

    $('#drop a').click(function(){
        // Simulate a click on the file input button
        // to show the file browser dialog
        $(this).parent().find('input').click();
    });

    // Initialize the jQuery File Upload plugin
    $('#upload').fileupload({

        // This element will accept file drag/drop uploading
        dropZone: $('#drop'),

        // This function is called when a file is added to the queue;
        // either via the browse button, or via drag/drop:
        add: function (e, data) {

            var tpl = $('<li class="working uploaded"><input type="text" value="0" data-width="48" data-height="48"'+
                ' data-fgColor="#0788a5" data-readOnly="1" data-bgColor="#3e4043" /><p></p><span></span></li>');

            var f = document.createElement("form");
            f.setAttribute('method',"post");
            f.setAttribute('action',"addTags();return false;");

            var i = document.createElement("input"); //input element, text
            i.setAttribute('type',"hidden");
            i.setAttribute('value',"fileName");
            i.setAttribute('name',"username");

            var t = document.createElement("input"); //input element, text
            t.setAttribute('type',"text");
            t.setAttribute('name',"tags");

            var s = document.createElement("submit"); //input element, Submit button
            s.setAttribute('type',"submit"););
            s.setAttribute('name',"login");
            s.setAttribute('value',"Add Tags");

            f.appendChild(i);
            f.appendChild(t);
            f.appendChild(s);


            document.getElementsById('filesUploaded')[0].appendChild(f);

            var imgNameInput = document.createElement("input");
            imgNameInput.setAttribute("name","tags");
            document.getElementById("imgList").appendChild(imgNameInput);

        // Append the file name and file size      
            tpl.find('p').text(data.files[0].name)
                         .append('<i>' + formatFileSize(data.files[0].size) + '</i>');

            // Add the HTML to the UL element
            data.context = tpl.appendTo(ul);

            // Initialize the knob plugin
            tpl.find('input').knob();

            // Listen for clicks on the cancel icon
            tpl.find('span').click(function(){

                if(tpl.hasClass('working')){
                    jqXHR.abort();
                }

                tpl.fadeOut(function(){
                    tpl.remove();
                });

            });

            // Automatically upload the file once it is added to the queue
            var jqXHR = data.submit();
        },

        progress: function(e, data){

            // Calculate the completion percentage of the upload
            var progress = parseInt(data.loaded / data.total * 100, 10);

            // Update the hidden input field and trigger a change
            // so that the jQuery knob plugin knows to update the dial
            data.context.find('input').val(progress).change();

            if(progress == 100){
                data.context.removeClass('working');
            }
        },

        fail:function(e, data){
            // Something has gone wrong!
            data.context.addClass('error');
        }

    });


    // Prevent the default action when a file is dropped on the window
    $(document).on('drop dragover', function (e) {
        e.preventDefault();
    });

    // Helper function that formats the file sizes
    function formatFileSize(bytes) {
        if (typeof bytes !== 'number') {
            return '';
        }

        if (bytes >= 1000000000) {
            return (bytes / 1000000000).toFixed(2) + ' GB';
        }

        if (bytes >= 1000000) {
            return (bytes / 1000000).toFixed(2) + ' MB';
        }

        return (bytes / 1000).toFixed(2) + ' KB';
    }

});

HTML是这样做的

 <form id="upload" method="post" action="actions/upload.php" enctype="multipart/form-data">
                    <input type="hidden" name="username" value="<?php echo $username; ?>" id="username">
                    <div id="drop">
                    Drop Here
                    <a>Browse</a>
                    <input type="file" name="upl" multiple />
                    </div>

                    <ul id="filesUploaded">

                    <!-- The file uploads will be shown here -->
                    </ul>
                    </form>

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似乎您正在尝试访问DOM中的元素，但它不在那里/尚未加载。你的剧本在头版吗？如果是这样，请等待内容加载$function{}，或者将脚本放在body标记的末尾。如果是这种情况，请相应地标记您的问题，并立即停止使用onsubmit之类的内联事件处理程序。您可能还希望放弃直接的DOM操作以支持。包含jQuery然后不真正使用它没有什么意义。事实上，您的代码示例看起来很像您从不同的源复制粘贴它们，而不理解它们的含义。不要这样做。可能重复的我理解有时帮助那些没有很好理解的人很烦人，但出于善意，我想请你回答我的问题。你应该替换js代码来记录ready hander。[香草js上的示例][1][1]：